Hello, You must seperate yourself from the philosophy that text fields and fields are coupled. In fact, they are completely different. iReport supports building RHS (right hand side) expressions in java, so open the proprties of your text field, go to the text field tab, and you will have access to the expression builder, as well as a simply text box to write your expression. Also, there's no ~reason~ to create a hidden field, simply create a variable that will do your running sum, and total sum - if you I'll provide some psuedo code because I don't know the Java types of the variables you're trying to divide: $V{runningSum}.intValue() / $V{totalSum).intValue() Depending on the Type of your display field, and which JRE you're using, you will have to modify that expression to compile under the version of java you're using.